https://bugs.winehq.org/show_bug.cgi?id=41560
--- Comment #7 from Alistair Leslie-Hughes leslie_alistair@hotmail.com --- (In reply to Nikolay Sivov from comment #6)
Where are those scrollbars on the demo UI? I can see on in message list, but it's working fine. And another one in folder treeview that is hard to tell if it's working or not, because treeview constantly repaints itself when I reduce its width to make scrollbar appear.
The constant redraws maybe another issue or related. Not sure.
I've reproduce the issue with another demo which is easier to spot. Run BCGPVisualStudioGUIDemo.exe Move the "Solution Explorer" splitter bar left so it will causes a scrollbar to appear in the Solution Explorer. Now both the Solution Explorer and Stage Page window scrollbars will appear unthemed. If then you mouse over the start page buttons, the scrollbar will revert back to it proper style.